Can't connect my HTC Desire to my pcSupport

I bought my HTC Desire about 18 months ago. The first few months I had no problem connecting to to my computer(Windows 7) whatsoever but recently it has become impossible. I always hear a double sound "bling bling". It sounds like it tries to connect but then gets rejected. I reinstalled the driver but it's still the same. If my phone is connected to the computer(USB) my computer freezes after a while.
I tried out connecting the phone to my notebook(Windows Vista) and my netbook(Window XP) but the problem is identical. The phone charges though so there is some kind of connection.

I guess it might be the memory card. Try a different one or make a backup of the contents, format and try it empty. I once had a similar problem with the installation of an app going wrong, which made connecting to a PC take a really long time.

I tried connecting the phone without the memory card(I didn't have a spare one) but it was the same double bing(connect: bing, disconnect: bing) sound and there was no connection. I tried the "turn it off, take out the battery, put battery back in, turn on" method like I read on the internet but it didn't work either. I'll try out the recovery mode method if I find out how it works.

Once you have done this soft reset the phone. This is to take out the battery while the phone is turned on, wait 10 seconds, then put the battery back in and start up the phone. Try to sync to the Pc then.

If you can remove all other sync software on the pc also please, as this often conflicts.

Once you have done this soft reset the phone. This is to take out the battery while the phone is turned on, wait 10 seconds, then put the battery back in and start up the phone. Try to sync to the Pc then.

If you can remove all other sync software on the pc also please, as this often conflicts.